Condensation product of aminosubstituted arseno compounds



Patented Sept. 11, 1934 j I UNITED STATES CONDENSATION PRODUCT OF AMINO- SUBSTITUTED ARSENO COMPOUNDS No Drawing. .A pplication August 15, 1931, S erial No. 557,428. .In Germany September 20, 1930 1 Claim. (01. 260-) The present invention relates tocondensation products of amino-substituted arseno compounds, more particularly to compounds ,of the following general formula wherein X stands for a radical of the group consisting of benzene and phenyl-pyrazolone which -;10 radicals may be further substituted, wherein Y stands for H or OH, and 11 may be 1 or 2.

We have found that compounds of the above constitution can be obtained by causing alkylene oxides, for instance glycide or propylene-oxide,

- ,15 and formaldehyde-bisulfite to react s imultaneously or in succession in either order with amino-substituted arseno. compounds containing at least two amino'groups.

The process is preferably carried out by dis:

2-20 solving a. salt, e. g. the hydrochloride of the arseno compound in water: and separating the free base from the solution-by addition of sodium carbonate and filtration. The base is preferably washed out. After suspending the free base in {25 an organic solvent, preferably in methyl alcohol,

are contained in the arseno compound. It may" be advantageous to add after jfthe addition of fthe' solution of formaldehyde' g, further quantityoi the sodium bisulfite solution. The solution thus obtained is neutralized, for'instancebyadding caustic soda solution. From the neutralized solu- The new compounds are useful therapeutics which, on account of their tolerability when perorally administered and their excellent actionon dysenteric amoeba, are very well suitable for treating amoebic dysentery.

The hydroXyalkylamino-group being present in the new compounds is, if required, appropriated for introducing bismuth into the molecule.

Thefoliowingexamples serves to illustrate the invention, but they arenot intended to limit it thereto.

(1) From a solution of 32 grams of the hydrochloride of 4arseno di-(1-phenyl-2.3 -dimethyl- 4-aminoe5-pyrazolone) in 640 cc. of water the base isiprecipitated by meansof sodium carbonate solution. After filtering by suction and washing the base is caused at 60 C.65 C. to react in SO cc. of methyl alcohol with 5 grams of glycide *To the solution thus obtained and cooled to room temperature cc. of 2-N-hydrochloric acid are added and then 12 cc. of sodium bisulfite (39%) are added, drop by 'dropk 41cc. OffOIIIlEildGf hyde solutionof 30% strength are thenadded'. .As soon as the solution can no longer be diazotized, it is neutralized and. filtered.

" tion the new product is separated by pouring the solution into alcohol which contains a small amount, e. g. about 10%, of ether. The precipitate hereby produced is filtered and can. be dried,

.55: e. g. in a vacuum.

- (2) 45 grams of 3.3'-diamino-4.4'-dihydroxyarsenobenzene-hydrochloride arestirred with 5i cc. of alcoholand dissolved by addition of 360 cc; of water. By addition of sodium carbonate the'baseis precipitated from the 'soluti'on' and PATENT .orrlcle filtered by suction. The washed base is caused at 60 C.-65 C. to react in 110 cc. of methyl alcohol with 10 grams of glycide. 100 cc. of Z-N-hydrochloric acid are addedto the filtered solution thus obtained, 9.4 cc. of bisulfite solution are then introduced, drop by drop and then 9.4 cc. of formaldehyde solution are added. After stirring for a short time another 14.6 cc. of bisulfite solution are added and the whole is stirred until the solution can no longer be diazotized. After the solution has been neutralized, it is filtered and the filtrate is introduced, while stirring, into 10 parts of alcohol and 1 part of ether.

The compound which separates is filtered by suction and is dried in a vacuum. It dissolves in water to a clear solution and has the following probable constitution:

OH 0H NH-OHz-O-S OaNa S$LS (3) 22.5 grams of 3.3'-diamino-4.4'-dihydroxyarsenobenzene-hydrochloride are, as indicated in Example 2, transformed into the base which is dispersed in cc. of methyl alcohol and heated in a closed vessel to (L- C. with 4 grams of propylene oxide CHz-CELCH:

until the whole is dissolved It is then cooled,

- filtered to a clear solution and mixed with 50*, cc. of N-hydrochloric acid. 4.7 cc. of bisulfite. solution (39%) and 4.7 cc. of formaldehyde'sm.

lution (30%) are introduced drop by drop, while vigorously stirring, and the whole is still stirred for 5 minutes. Then 7.3 cc. of bisulfite solution are introduced drop by drop and the whole is stirred for 4 hours. The solution which can no longer be diazotized is neutralized with caustic soda solution, poured into 10 times its quantity of alcohol which is mixed with 10% of ether.

the precipitate is filtered by suction and washed with a mixture-of alcohol and ether and then with ether. The compound which has been dried in a vacuum is a yellow powder, which dissolves in water to a clear solution having a neutral reaction. It probably has the following con-- stitution:

OH OH NHCHa-CHOHCH: NH-CHrO-S OzNa dissolves in water with a neutral reactiom It probably has the following constitution:

' Nn-onrononfomon We claim: v The compound of the following formula being a yellow brownish substance, soluble in water to a clear and neutral solution and being a valuable therapeutic.

KARL STREITWOLF. ALFRED FEHRLE. PAUL FRITZSCHE. WALTER HERRMANN. 

